Hemstitch attachment for sewing machines



@ci. 27, 193110 1:..1. g casmx gfl HEMSTITCH ATTACHMENT FOR SEWING MACHINES Filed Aug. 19. L929 I IN'VENTOR iiaarffigada Aim ATTORNEY Patented Oct. 27, 1931 UNITED STATES VICTOR J. SIGODA, OF BROOKLYN, NEW YORK HEMSTITCH v.A'I'LJLCHIMJ-LIQI'J. FOR SEWING MACHINES Application filed August 19, 1929. Serial No. 386,837.

The present invention relates to hemstitch sewing machines, and has for its main object the provision of an improved gath ing a device, the invention being in the nature of a novel attachment produced especially for use in connection with the Singer type of machines, such for ins ance, as Nos. 72w19 and 72w20, although it is to be understood that the attachment is not confined to that particular type or to such particular make of machines.

An important object of the invention is the provision of an attachment of the charsacter described, which will gather and group the fibers'or strands of the material into a zigzag or serpentine hemstitch pattern, and

one in connection with which the needles of the machine, functioning in the usual man- -ner, will cooperate to stitch the grouped fibe'rs or strands both on the right and left sides, to produce a permanent hemstitch of a zigzag OI serpentine pattern.

A further object of theinventi-on is the -provision of-anjattach'ment of the charact-er described'for ornamenting, bordering, or

hemming fabric with a zigzag or serpent ne hemstitch, in contradistinction to the cross hemstitch now g nerally used A further object of the invention is the provision of an improved attachment having improved means f r pler lng and grouping the fibers or strands of the fabric.

With the foregoing objects and others inv i view, the invention resides in the f rms and details of construction and in novelties of combination and arrangement, as will be hereinafter more fully described, illustrated in the accompanying drawings, and particularly pointed out in the snbjoined claims.

Fora full understanding of the invention reference. is to be had to the. accompanying drawings, which formf a material part of this application and which spective View showing a hemstitch sewing machine equipped with my improved attachment? r s, e, ands representdetail ws on. a large scale,"of the attachment;

Figure 1 represents a fragmentarypen Fig. 5 represents a cross section on the line 55 of Fig. 2;

Fig. 6 represents an exaggerated plan view of the zigzag or serpentine hemstitch pattern produced by the attachment; and

Fig. 7 represents a View similar to Fig. 6, but showing a. modification in the design of the pattern. i

' Referring first to the well-known parts of the Singer machine, No. 72wl9,.fractionally illustrated in Fig. 1 of the accompanying drawings, the numerals 1O designate the needle holders, 11 the needles, 12 the needle vibrating levers, 13 the needle vibrating lever screws, and 14: denotes the presser foot, 15' the presser foot holder. and '16 the .piercer holder.

In this assembly the attachment of my in vention is denoted generally at l7 and is shown as attached to theusual piercer holder 16 for cooperation with the needles ll in the same way as the usual piercer employed in connection with this type of sewing machine. By thosefamiliar with the art, it will be un-v derstoodthat the conventional piercer (not shown), which is applied to the holder 16, produces the cross hemstitch pattern now generally used. 'My new attachment 17, designed to pierce the fabric, gather a group of the fibers and form them into an obliquehemstitch coursefor the production of a zigzag or serpentine pattern, has a standard stem 18 so that it may be applied to the piercer holder 16 in place of and in substitution for the usual piercer. 7

Although having in practice, as above intimated, the three-fold function of piercing the fabric, gathering fibers and placing them into oblique groups, my attachment 17 may, for convenience of reference, be hereinafter referred to simply .as a gathering device. The preferred-form of construction of the gathering device 17, as illustrated in Figs. 1 tof5, inclusive, comprises right and left elongated parts or blades '19; which are formedor'lotherwise produced on the for-# wardly offset lower end portion 20 of the standard stem 18.. I The two blades 19 are separated by: an elongatedslot 21 having a flaring gateor mouth opening '22 formed'be tween the oppositely directed piercing points 23. L

For a portion of their length, the inner edges of the elongated blades, defining the slot 21, are rounded as at 24, both at the front I and rear faces of the blades. Between the pierc' fpoints and the pointsof their union wi s e n blades 19 in a plane of symmetry transversel to the direction of feed of the work or fa ric, the a intersect the fi ersor strands 27,,

at right angles. By thus'withdrawing sucely a' series of fibers as 27, only the transverselyextending fibers 28 remain. The fabricis placed in sewing position under the a foot and fed in a direction away from' the operator with the transverse fibers 28, upon which the device 17 operates directly,- paitioned transvemely to the line of feed of the'work. g The stitching mechanism inthe needles 11 operates in the usual r, r to producethe right and left lines of .29 and 30 with the lock stitches 31 and 3 2. in the line of stitching and with the lock-stitches 33 laterall ofiset relativelyw as the line of stitching. T e attachment 1 periodically penetrates the work, dividin out, gathering and: positioning the grou s o fibers in advance of the production the stitches by which the groups of fibers era tied in place. i

Accordin to an important feature of the invention, t e piercing point on one of the blades curves forward y'toward'the operator while the piercing point of theother of the curves rearwardly away from the op- 'festly, by this arrangement, when the device descends two depth erforations are made in advance of the nee leswith the re- 5: suit that a group of the transverse fibers is eng'a 891 b ween the two; enetrating points well!) through, the mout opening 22 into the opening 21 and thence onto*the inneredge: v24. As a result of this gi'ation, the g red group of transverse ill 2 28 amie tmed into an obliquely extend ipg, qourse'fi, 'Each time the devices de? .2- it"diyides eat and gathers between the prospective lines of stitching agroup of pggitipns them in a course 34 ex- W 20, the bodiesof: the I are expanded or enlarged as shown of therfi ers in courses obliquely to the line of feed, and as well to the binding effect of the lock stitches and especially of the laterally ofiset lock stitches 33, the repetition of the courses 34 and 34' results in the formation of a zigzag or ser entine pattern.

As illustrated in t e modlfication shown in Fig. 7, one or more of the fibers or strands 27' may remain unpulled in the longitudinal centra region between the prospective; lines of stitches 29 and 30. By leaving these unpulled fibers or strands in the central region, the two blades of the descending device during the formation of the oblique courses, stra dle these fibers or strands without substan ially altering their position, so that in this case the completed serpentine hemstitch will'fhave a longitudinally extending central cqgr e connecting the courses 34 and 34.

t, will be. apparent'fr-om the foregoing 06 description, taken in connection with the accompanyingdrawings, that I have produced a 11 vial and useful hemstitch attachment which embodies the features of advantage enumerated in the statement of invention and 10 the above. description; and while I have, in the present instance, shown and described in detail-a preferred embodiment thereof, it is to be understood that it is susceptible of modification, in various particulars without I06 departing from the spirit or scope of my in ventio ljor sacrificing any of its advantages.

I claim v. 1. In a hemstitch sewing machine, embodyin stitch forming mechanism including llo r. t and left needles for producing right and left courses of stitching in the direction ofthe feed of the work, and a gathering device coacting with the needles, itsconstrue tion including blades having piercing points I}; curving in opposite directions for forming in advance of the stitching, groups of fibers, so disposed relative to each other as to produce a serpentine hemstitch pattern.

2. In a hemstitch sewing machine, em- 1659 bodying stitch forming mechanism including right and left needles for producing right and left courses of stitching in the direction of the feed of the work, a gathering devicecoat-tings with the needles and adapted .to 86 91m in advance of the stitching, inclined; greups-Qfifibi rgsaid gathering device eluding right and left piercing blades the; piercing pointsofwhich are bent in oppo ite directions with to each other t9 gather and form between the blades, on each piercing operation, an inclined group of fibers.

3. In a hemstitch sewing machine, embodying stitch forming mechanism including right and left needles for producing right and left courses of stitching, a gathering device cooperating with the needles to gather a group of fibers between the paths of the needles and in advance of the stitching, said gathering device comprising right and left blades with a space between them, said blades having piercing points curving in opposite directions so as to gather between them a group of fibers for entry into said space, to be retained in said space by said blades while being stitched at the right and left in the right and left courses of stitching performed by saidneedles.

4. In a hemstitch sewing machine, embodying stitch forming mechanism including right and left needles for producing right and left courses of stitching in the direction of the feed of the work, a gathering device cooperating with the needles to form in advance of the stitching, groups of fibers, obliquely inclined with respect to the direction of travel of the work, said ga'hering device comprising right and left blades the bodies of which lie in a plane transverse to the direction of travel of the work, and said blades having piercing points bent in opposite directions.

5. In a hemstitch sewing machine, embodying stitch forming mechanism including right'and left needles for producing right and left courses of stitching in the direction of the feedof the work, a gathering device cooperating with the needles to form in advance ofthe stitching, groups of fibers, 0bliquely inclined with respect to the direction of travel of the work, said gathering device comprising right and left blades the bodies of which lie in a plane transverse to the direction of the travel of the work, and piercing points on said blades bent forwardly and ackwardly to gather and feed a group of fibers obliquely between the bodies of the blades so as to be secured by the two courses of stitching.

6. An attachment for hemstitch sewing machines for the purpose set forth, comprising a stem for connection with the piercer holder, two piercing blades united at their upper ends to the stem and otherwise separated, the bodies of the blades being enlarged in a plane of symmetry and narrowing to piercing points curving in opposite directions, said points being adapted, 'when piercing fabric, to gather fibers between them at an angle to the plane of symmetry and to direct the gathered fibers between said blades.

7. An attachment for hemstitch sewing machines for the purpose set forth, comprising a stem for connection with the piercer holder, two piercing blades united at their upper ends to the stem and otherwise separated, said blades having piercing points and expanding bodies between the piercing points and the union with said stem, the piercing points being curved in opposite directions from the bodies so as to gather, When piercing fabric, a group of fibers between them and to direct the received group between the bodies to be there positioned at an angle with respect to the plane of enlargement of the bodies.

8. An attachment for hemsiitch sewing machines for the purpose set forth, comprising a pair of blades connected at their upper ends and otherwise separated, said blades having piercing points curving in opposite directions and adapted, when piercing fabric, to receive a group of fibers between them and direct the received group between said blades.

9. An attachment for hemstitch sewing machines for the purpose set forth, comprising a pair of blades connected at their upper ends and having an elongated space between them, said blades having piercing points curving in opposite directions and adapted, when piercing fabric, to receive between them courses of fabric intersecting at right angles and to direct said courses between the blades, the bodies of the blades being formed to position one of the intersecting courses at an oblique angle with respect to the other of the intersecting courses.

10. An article of manufacture, a gathering device of the character described comprising a stem, a pair of elongated blades connected at one end to the stem and having an elongated opening between them, and piercing points on said blades curving in opposite directions and forming a gaiee opening to said elongated opening.

In testimony that I claim the foregoing as my invention, I have signed my name hereto.

VICTOR J. SIGODA. 

